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Regulatory Matters - Regulatory Proceedings (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 01, 2021 | Jun. 01, 2021 | Dec. 31, 2021
BELCO |  |  |
Regulatory Liabilities [Line Items] |  |  |
Weighted average cost of capital (percent) |  | 7.50% |
Annual revenue increase |  | $ 211,432 |
Deferred revenue |  | $ 13,426 |
Deferred revenue, period of collection |  | 5 years |
EnergyNorth Gas System |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual revenue increase | $ 6,300 |  |
Requested increase, 2020 | 4,000 |  |
Requested increase, 2021 | $ 3,200 |  |
Various |  |  |
Regulatory Liabilities [Line Items] |  |  |
Annual revenue increase |  |  | $ 800

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